Carpenter&#39;s square.



P. .n cooLEY. GARPENTERS SQUARE. A

APPLICATIONTIEJJD NOV. 25, 1907.

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- 'PATENTED AUG. 4, 190s;

PULASKI J. COOLERVOF CHICAGO, ILLINOIS.

CARPENTERS SQUARE.

Specification of Letters Patent.

Patented Aug. 4, reos.

Application filed November 25, 1907. Serial 110.403,62;

To all whom it mayconcern:

Be ity known that I, PULAsh-I J. CooLEY, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented a certain new and use ful Improvement in Carpenters Squares, of which the following is a specification.

This invention relates to carpenters squares. Its principal objects are to make a square separable into parts in such a manner that it can be readily taken apart forthe purpose of more convenient carrying, and in order that it may be placed into a. comparatively small box; and also to provide means to join the several parts firmly and accurately together, and to cheapen construction. I attain these objects by the means illustrated in the accompanying drawing, in which l Figures 1 and 2 are plan views of two different cons'tructionsof my improved square fully assembled; while Figs-3, et and 5 are enlarged sectional views, on the lines 3 3, 4-4, and 5-5, of the parts shown in Fig. 1.

Referring to the drawings, blades 7 and S of my improved square are joinedtogether by rectangular member 9, the connection between said blades and member 9 being made by tongues 1() and 11 (of blades 7 and S respectivel Y) which are preferably constructed with a slight taper from their bases towards their ends, and fit int-o corresponding grooves 12 and 13 (cut lengthwise in the larger and smaller arms of member 9 respectively) the margins 15 of which are undercut to correspond to dovetailed edges 16 of tongues 10 and 11. To reduce cost of manufacture I prefer to run groove 12 the whole length of the larger arm of member l, and to run groove 13 from groove 12 to the end of the secure smoothness of surface of the square I either form the end of tongue 11 with an undercut edge, corresponding to margins 15, so as to i lit the dovetailed edge of tongue 10, or form smaller arm of member 9. To

the end of tongue 11 square while cutting away the abutting portion of tongue 10. In

this latter form of construction 4(shown in Fig. 2.) tongue 11 should be'made long enough to project (when theD square is assembled) into tongue 10, thus serving to V i 5 i l l I lock tongue 10, and with it blade 7, in position. In all cases blades and 8, where tongues 10 and 11 are projecting from them, and the respective o )posite ends of member 9 are formed of sucll thickness, width and shape as to mutually correspond in these particulars, so as to make close fitting joints and a smooth continuous surface over the whole square when assembled. Tongues 10 and 11 are preferably made of about one-half the thickn'es of blades 7 and S, and shoulders 17 at the jubihfture of tongues l() and 11 to blades 7 and `S `respectively, are made rounded to preventeasy breaking at this point of weakness.

To more firmlyv hold the parts together in assembled posit1en,lloeking screws 19 are provided the head "ofxwhich fit into countersunk holes in meml'erQ, and the threaded points of which engaghj'corresponding threads in tongues 10 and 11 respectively. In the construction sheen in Fig. 1. two of such screws are employed, one,fffo\r.`each tongue; while in the construction shown in Fig. 2. only one such screw is used, for the purpose of locking tongue 11 in positionsr,

ll'hat I claim as my invention, and intend to secure by Letters Patent, is:-

1. In a separable square, the combination of a. right angled connecting member havin grooves with undercut margins, one of sai grooves extending the full length of one arm of said member, and the other extending from such first mentioned groove to the end l of the other arm; blades ith dovetailed i tongues, integral with said blades and litt-ing l into said grooves g and means for securing the l parts in assembled posit-ion.

2. In a separable square, the combination of a right angled connecting member, having `grooves with undercut margins. blades with dovetailed tongues, integral with said blades and fitting into said grooves g a notch in the edge of one of said tongues, ada )ted to rei ceive and fitting the end of the other tongue, and means for securing the parts in assembled position.

PULASKI J. COOLEY. i In presence of l JOHN M. RAUHOFF,

GUsTAv SCHULZ.

1 UNrrED sTfftTnsPArrENT OFFICE, 

